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Synthetic method of slow resilience foam polyether polyol

A polyether polyol and a synthesis method technology, applied in the chemical industry, can solve the problems of low resilience, volatilization, inability to fully suppress temperature changes and hardness changes, and achieve the effects of small hardness changes and easy technical indicators

Active Publication Date: 2011-02-09
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the method of mixing two or more specific polyols having different hydroxyl values ​​to form a flexible foam in the above-mentioned conventional technology, there is a problem that the hardness change corresponding to the temperature change cannot be sufficiently suppressed.
[0005] In the prior art, it is also possible to reduce the resilience (resilience rate) of polyurethane elastomers by blending plasticizers in flexible foams, and by adding an appropriate amount of plasticizers, a desired degree of elasticity can be obtained. However, the added plasticizer will volatilize during use and may be inhaled by the human body, so substances harmful to the human body cannot be used
In addition, the plasticizer may dissolve when the foam is washed, and it is difficult to maintain the low resilience of the foam after repeated washing

Method used

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  • Synthetic method of slow resilience foam polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 82g of glycerin into a 5-liter stainless steel kettle for nitrogen replacement. After the oxygen content in the kettle is measured to be less than 100ppm, vacuumize to -0.098Mpa, draw in 12g of potassium hydroxide in a sealed manner, raise the temperature to 80°C, and start adding propylene oxide and ring Ethylene oxide, keep the temperature in the kettle at 50-60°C, and the pressure at 0-0.1Mpa, continuously add 3428g propylene oxide and 490g ethylene oxide, after the feeding is completed, react under internal pressure for 2 hours, and vacuum remove the unreacted Propylene oxide and ethylene oxide monomers, add 24g of phosphoric acid to neutralize, then use the Buchner funnel to filter the material, re-add the obtained filtrate in the reactor, and add 200g of deionized water and 8g of magnesium silicate to carry out Stir, then vacuum dehydrate for 2 hours, keep the temperature in the kettle at 103-107°C, then use a Buchner funnel to filter the material again, add th...

Embodiment 2

[0020] Add 40g glycerin and 42g diethylene glycol in a 5-liter stainless steel kettle, and carry out nitrogen replacement. After the oxygen content in the kettle is less than 100ppm, vacuumize to -0.098Mpa, and airtightly suck in 8g potassium hydroxide and 4g sodium ethylate, and heat up to 80°C, start to add propylene oxide and ethylene oxide, keep the temperature in the kettle at 70-80°C, and the pressure 0.1-0.2Mpa, continuously add 3428g propylene oxide and 490g ethylene oxide, after the feeding is completed, the internal pressure reaction For 2 hours, the unreacted propylene oxide and ethylene oxide monomers were removed in a vacuum, 24g of phosphoric acid was added for neutralization, and then the material was filtered using a Buchner funnel, and the obtained filtrate was re-added to the reactor, and added Stir 200g deionized water and 8g magnesium silicate, then vacuum dehydrate for 2 hours, keep the temperature in the kettle at 103-107°C, then filter the material again ...

Embodiment 3

[0022] Add 31g of propylene glycol and 20g of ethylene glycol into a 5-liter stainless steel kettle, and carry out nitrogen replacement. After the oxygen content in the kettle is less than 100ppm, vacuumize to -0.098Mpa, draw in 6g of potassium hydroxide and 6g of sodium methoxide, and heat up to 80 ℃, start to add propylene oxide and ethylene oxide, keep the temperature in the kettle 80-90 ℃, pressure 0.2-0.3Mpa, continuously add 3456g propylene oxide and 494g ethylene oxide, after the feeding is completed, the internal pressure reaction 2 hour, vacuum removed the unreacted propylene oxide and ethylene oxide monomers, added 24g of phosphoric acid for neutralization, then used the Buchner funnel to filter the material, re-added the obtained filtrate to the reactor, and added 200g Stir with deionized water and 8g of magnesium silicate, then vacuum dehydrate for 2 hours, keep the temperature in the kettle at 103-107°C, then use a Buchner funnel to filter the material again, add t...

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Abstract

The invention relates to a synthetic method of slow resilience foam polyether polyol, which is characterized by adopting a polyalcohol compound as an initiator, and taking alkali metal as a catalyst and acetic anhydride as an end sealing agent to polymerize with epoxy compound at the pressure of 0-0.5 Mpa and at the temperature of 50-150 DEG C to obtain the slow resilience foam polyether polyol. The process is convenient for workers to operate; the technical index is easy to control; and the prepared new-type slow resilience foam polyether polyol can be used for various slow resilience foam products, and has the characteristic of smaller hardness change at the condition of temperature change.

Description

technical field [0001] The invention relates to a method for synthesizing slow-rebound foam polyether polyol, which belongs to the field of chemical industry. Background technique [0002] It is well known that a soft polyurethane foam having a low rebound rate, that is, a slow resilience, is used as a shock absorber or a shock absorber. In addition, when used as a cushion material and cushion of a chair, it can evenly distribute body pressure and reduce fatigue and floor displacement. [0003] In the prior art, in order to obtain a low-resilience flexible foam with good resilience at room temperature and less hardness increase at low temperature, mixed polyether polyols are generally used, which include 32 to 80% by weight of the average functional Degree digit 1.54.5, hydroxyl value 140~300mgKOH / g polyol, like this, can make a kind of polyurethane soft foam, and this foam is in the temperature range of -50 ℃~-25 ℃, and in 30~ In the temperature range of 55, each has at l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48
Inventor 马小科孙刚郭辉刘小会
Owner SHANDONG BLUSR DONGDA CHEM
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